{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.49.6"
              },
              {
                "fixed": "0.16.1"
              },
              {
                "introduced": "1.50.0-next.0"
              },
              {
                "fixed": "1.54.6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "f29d18c2fd55f0448f0fbaf8525178676dccd52d"
            },
            {
              "fixed": "e8c20440640d1d2baffbf6e44a71e6960e5eb2ec"
            },
            {
              "fixed": "278b50f5dfce326beba891c7aafc12cf1e65c5c0"
            },
            {
              "fixed": "0e67bc1fc88fba3a8cb716d3584cef05ecbcf9a8"
            },
            {
              "fixed": "40346245c53e1bf26dee56601e95c5c4ab9cc124"
            },
            {
              "fixed": "bc80ffdafbc92ff7b8c72347eace13cb8688fd33"
            }
          ],
          "repo": "https://github.com/backstage/backstage",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-cq7v-rfgc-5c7v"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-269",
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106492.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "0.17.0"
          },
          {
            "fixed": "0.17.8"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.",
  "id": "CVE-2026-106492",
  "modified": "2026-10-08T02:30:39.206510203Z",
  "published": "2026-10-06T20:48:05.896Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106492.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106492"
    },
    {
      "type": "FIX",
      "url": "https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124"
    },
    {
      "type": "FIX",
      "url": "https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Backstage: Improper preservation of access restrictions during service credential delegation"
}